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Question: What does A.d.Fail (Error 3) mean?, and what can I do about it?

Answer: A.D.Fail (2001 firmware) or Error 3 (2101 firmware) both indicate that the processor has lost communication with the input circuit. The input needs to be converted to a digital signal that the processor can understand (A.D. stands for analog to digital). The instrument is in need of repair.

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